Most galaxies in the Local Group are
A) dwarf spirals.
B) small irregulars similar to the Magellanic Clouds.
C) larger spirals than either the Milky Way or M-31 in Andromeda.
D) dwarf ellipticals, similar to the companions of M-31.
E) brown dwarfs, with even more dust than our own Galaxy.
D
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An electron travels under constant acceleration from a heated filament in an electron gun to the tip of the gun, where it is emitted. If the final speed of the electron is 
m/s, and the length of the gun from filament to tip is 1.25cm, what was the acceleration the electron underwent?
A. 
B. 
C. 
D. 
E. 
F. 
What will happen to our Hydrogen and Helium nuclei in order to form Hydrogen and Helium atoms?
A.) Have to add protons. B.) Have to add neutrons. C.) Have to add electrons. D.) Have to add photons. E.) Have to add down quarks.
Explain why cars are responsible for so much of the carbon monoxide emitted every year (see Table 15.5)
What will be an ideal response?
For carbon dioxide, the van der Waals constants are: a = 0.364 J?m3/mol2, and b = 4.27 × 10-5 m3/mol
Assuming that the van der Waals equation holds at the critical point (where the p-V curve first becomes horizontal and has a point of inflection), what is the critical temperature of carbon dioxide? A) 513 K B) 592 K C) 304 K D) 1026 K E) 326 K